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            | 
                    Closing price on 9/1/2016
                 |  |  
    
        |           
                
                    | Open | 32.20 |  
                    | High | 32.30 |  
                    | Low | 31.70 |  
                    | Volume | 122,550 |  
                    | Split-adjusted Price | 19.97 |  
                
             | 
 |  NAF Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 9/1/2016 | -0.10 / -0.31% | 32.20 | 32.30 | 31.70 | 32.10 | 32.11 | 19.97 | 122,550 |   |  
            | 8/31/2016 | +1.60 / +5.23% | 30.60 | 32.50 | 30.40 | 32.20 | 31.26 | 20.04 | 195,340 |   |  			
            | 8/30/2016 | +0.60 / +2.00% | 30.00 | 30.70 | 29.70 | 30.60 | 30.21 | 19.04 | 196,090 |   |  
            | 8/29/2016 | -0.10 / -0.33% | 30.00 | 30.40 | 30.00 | 30.00 | 30.17 | 18.67 | 136,810 |   |  			
            | 8/26/2016 | +0.10 / +0.33% | 30.00 | 30.40 | 30.00 | 30.10 | 30.20 | 18.73 | 167,540 |   |  
            | 8/25/2016 | -0.30 / -0.99% | 30.30 | 30.30 | 30.00 | 30.00 | 30.11 | 18.67 | 143,210 |   |  			
            | 8/24/2016 | +0.50 / +1.68% | 29.80 | 31.00 | 29.80 | 30.30 | 30.26 | 18.85 | 179,770 |   |  
            | 8/23/2016 | +0.90 / +3.11% | 28.80 | 29.90 | 28.60 | 29.80 | 29.22 | 18.54 | 189,170 |   |  			
            | 8/22/2016 | +0.50 / +1.76% | 28.40 | 28.90 | 28.30 | 28.90 | 28.55 | 17.98 | 144,720 |   |  
            | 8/19/2016 | 0.00 / 0.00% | 28.30 | 28.50 | 28.20 | 28.40 | 28.35 | 17.67 | 131,800 |   |  			
            | 8/18/2016 | +0.10 / +0.35% | 28.30 | 28.40 | 28.20 | 28.40 | 28.34 | 17.67 | 140,880 |   |  
            | 8/17/2016 | 0.00 / 0.00% | 28.30 | 28.40 | 28.10 | 28.30 | 28.25 | 17.61 | 142,410 |   |  			
            | 8/16/2016 | -0.10 / -0.35% | 28.40 | 28.50 | 28.20 | 28.30 | 28.35 | 17.61 | 147,160 |   |  
            | 8/15/2016 | +0.20 / +0.71% | 28.20 | 28.50 | 28.10 | 28.40 | 28.31 | 17.67 | 134,980 |   |  			
            | 8/12/2016 | -0.30 / -1.05% | 28.50 | 28.50 | 28.10 | 28.20 | 28.29 | 17.55 | 142,940 |   |  
            | 8/11/2016 | +0.20 / +0.71% | 28.30 | 28.60 | 28.10 | 28.50 | 28.36 | 17.73 | 157,060 |   |  			
            | 8/10/2016 | 0.00 / 0.00% | 28.30 | 28.60 | 28.30 | 28.30 | 28.41 | 17.61 | 143,590 |   |  
            | 8/9/2016 | +0.10 / +0.35% | 28.10 | 28.50 | 28.10 | 28.30 | 28.33 | 17.61 | 127,070 |   |  			
            | 8/8/2016 | +0.10 / +0.36% | 28.00 | 28.30 | 27.80 | 28.20 | 28.07 | 17.55 | 125,590 |   |  
            | 8/5/2016 | +0.10 / +0.36% | 27.80 | 28.10 | 27.70 | 28.10 | 27.94 | 17.48 | 160,900 |   |  			
            | 8/4/2016 | +0.10 / +0.36% | 27.90 | 28.20 | 27.90 | 28.00 | 28.04 | 17.42 | 142,440 |   |  
            | 8/3/2016 | 0.00 / 0.00% | 27.90 | 27.90 | 27.60 | 27.90 | 27.81 | 17.36 | 135,560 |   |  			
            | 8/2/2016 | -0.30 / -1.06% | 28.00 | 28.00 | 27.70 | 27.90 | 27.89 | 17.36 | 172,170 |   |  
            | 8/1/2016 | -0.10 / -0.35% | 28.30 | 28.30 | 28.00 | 28.20 | 28.18 | 17.55 | 115,230 |   |  			
            | 7/29/2016 | -0.30 / -1.05% | 28.60 | 28.60 | 28.20 | 28.30 | 28.41 | 17.61 | 148,900 |   |  
            | 7/28/2016 | -0.10 / -0.35% | 28.70 | 28.80 | 28.40 | 28.60 | 28.63 | 17.80 | 146,060 |   |  			
            | 7/27/2016 | +0.10 / +0.35% | 28.60 | 28.90 | 28.40 | 28.70 | 28.70 | 17.86 | 137,320 |   |  
            | 7/26/2016 | -0.20 / -0.69% | 28.70 | 28.90 | 28.60 | 28.60 | 28.68 | 17.80 | 151,760 |   |  			
            | 7/25/2016 | +0.30 / +1.05% | 28.50 | 28.80 | 28.30 | 28.80 | 28.60 | 17.92 | 131,830 |   |  
            | 7/22/2016 | -0.20 / -0.70% | 28.70 | 28.70 | 28.30 | 28.50 | 28.49 | 17.73 | 136,150 |   |  |